High temperature monoclinic-to-tetragonal phase transition in magnesium doped lanthanum ortho-niobate

Aleksandra Dorota Mielewczyk-Gryń; Katarzyna Gdula-Kasica; Bogusław Kusz; Maria Gazda

doi:10.1016/j.ceramint.2012.09.102

High temperature monoclinic-to-tetragonal phase transition in magnesium doped lanthanum ortho-niobate

Abstract

Magnesium doped lanthanum ortho-niobate (La0.98Mg0.02NbO4) was prepared by the molten salt synthesis method. X-ray diffraction and dilatometry methods were used to study high temperature behavior of the ceramic material. Special attention was paid to the phase transition between the monoclinic and tetragonal phases. The values of spontaneous strain on the basis of unit cell parameter, obtained by Rietveld refinement, have been calculated as well as Landau order parameter. The thermal expansion coefficient (TEC) of La0.98Mg0.02NbO4 was determined to be 12×10−6 1/K and 8×10−6 1/K below and above 500 °C, respectively.

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Authors (4)

Aleksandra Dorota Mielewczyk-Gryń dr hab. inż.
Katarzyna Gdula-Kasica dr inż.
Bogusław Kusz prof. dr hab. inż.
Maria Gazda prof. dr hab. inż.

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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: CERAMICS INTERNATIONAL no. 39, edition 4, pages 4239 - 4244,
ISSN: 0272-8842
Language:: English
Publication year:: 2012
Bibliographic description:: Mielewczyk-Gryń A., Gdula-Kasica K., Kusz B., Gazda M.: High temperature monoclinic-to-tetragonal phase transition in magnesium doped lanthanum ortho-niobate// CERAMICS INTERNATIONAL. -Vol. 39, iss. 4 (2012), s.4239-4244
DOI:: Digital Object Identifier (open in new tab) 10.1016/j.ceramint.2012.09.102
Verified by:: Gdańsk University of Technology